Method of rolling tubing.



Patented Oct. 1, 1912.

llllllllllllllllllll li! I lnlll. .IIII u R. E. BROCK. METHOD 0I' ROLLING TUBING. ArPLIoATIoN 1111.121) un. ze, 1911'.-

WITNESS" 1.6? 7:/

i To all whom 'it may concern."

UNITED OFFICE.- f

monaten n. Bacon, or MoNEssEN, rENnsrLvANIA, AssIGNoze ro PITTSBURGH strain.i PRODUCTS co., or rirrsnunsrr, rnNNsYLvANLa, .A conroRArIoN..

METHOD F ROLLING TUBNG.

Specification of Letters Ilatent.l

Patented oct. 1, 19,12.

Application meanprii 2e, ian. serial No. 623,498.

Be it known that I, RICHARD E. BROCK, a 'citizen of theUnited States, resident of Monessemin the county of' Westmoreland and State of Pennsylvania, have invented a new anduseful Improvement in Methods of Rolling Tubing; and I do hereby declare the followin to be a full, clear, and exact description t ereof.

Myfinven'tion relates to amethod of roll ing seamless tubing. Y The'object o/my invention is to provide a rapid and eicient method of rolling seamless tubing in which a mill with upper and lower passes may be employed, the steps of the process being such as to makeit ossible to dispense with the cumbersomefta les for the supporting Amandrels heretofore employed .iny rolling tubing in la mill with L, upper and lower passes, as well as the mechj agaism and the power necessary to raise and .slower such tables.

i# lc' these ends my invention consists, generally stated, in the method of rolling seamless tubing in a mill having upper and lower; passes consisting in feeding the tubular blank through the first pass of the-mill onto a mandrel, withdrawin the ymandrel leaving the blank inl the position in which it wasv delivered from the rolls', movin the blank to a different level into line wit the second pass of the mill, passing the blank back through said second pass onto a man drei, and withdrawing the mandrel.

klin the accompanying. drawing Figure V1 is aside elevation partly in section of a suitable mill for carryingv out my invention;

lEig.. 2 is a plan view;` Fig. 3 is a view lookiii? ing in one directiontowardthe rolls; Fig. d 1s a view from the opposite side, the views being. taken on the lines 3 3 and 4-4 of Figr'l respectively; and Figs. 5 Vand 6 ehowdetails of the pusher.' A l will rst describe suitable apparatus by which my improved method is-carried out, and accordingly in the drawings the numeral-2 designates suitable housings of a three-,high mill with the rolls 3, 4 and 5. These. rolls are formed with grooves to form the passes which are designated by the nunierals V3, 4a and 5B. It is, of course, understood that a mill with a greater number of passes or different arrangement 'thereof may be employed' to carry out my invention. At one yside of the rolls is the standard or mandrel 7 at that side of the mill.- AThis mandrel 7 rests on Vthe supports 8 arranged at suitable intervals; The outer endlof the mandrel 7 V carries the mandrelplug 9 which 1s adapted to enter the pass of the rolls. The tubular lblank 10 is adapted to rest in the troughs 11 and 12 which are in line with" the passes 3 and 5 of the rolls,- Inline with thetroughs 1,1 and 12 are the cylinders 13 and 14 respectivel andthe piston rods are provided with t e pushers. 15.' These pushers have combined with .them'a gripping device which is adapted to seize the mandrel when the pusher has been advanced .until the'tubular blank has been forced through the rolls, andthis combined usher `forms the subject of a separate application for Letters Patent of the United States filed by W. M. Selkirk and myself on the 19th day 0f- December, 1910, Serial No. 598,146. The pusher 15 is composed of the hollow body 15a with the opening 15h at the front end, The jaws 15c are engaged by the conical head 15d on the piston 15e. lA spring 15t engages thel piston 15e and the abutment 15h; 4In* Fig. 5 the jaws are gripping the mandrel. Air has been admitted to' withdraw the pusher and .this air acting onl has beendrawn through the rolls the air is exhausted and the spring 15t will move the piston 15e to release the jaws and release the mandrel.

"Supported by the supports 8 is the rod 1.6, said rod carrying the hinged'or swing- -ing hoods 17 suspended above the supportsY 8. A cylinder 18 is carried onthe shelf 19v extending out from one of the supports 8 and the piston of said cylinder is connected l to a lug 19 on one of the hoodsl?. As the g hoods are all rigidly secured to the rocking Qbar 16 theniovement of one of said hoods jby the cylinder 18 will act .to move all of lsaid hoods for the purposefully hereinafter set forth. Skids 20 extend from'the ;`top of the supports 8 down at an an lel so as -to deliver the tube sliding on sai skid to the trough 11 when the tubefis to be ibrought into line with the third pass.

At the opposite side of the rolls are the sectional troughs 21 to receive the mandrels 22, 23, which bear at their 5 the backstop 24:; Y

outer ends against frame 6 which forms a backstop for the',

ici

The cylinders 25 are arranged vertically to lift the tube to the upper or second pass 4a and the pistons of said cylinders carry the swinging supports 26, said supportsv having. the concave seats 27 to receive the tubular blank. The swinging supports 26 are 'held in the position indicated in full lines line with the trough 28 is the cylinder 29 which has the combined pusher and gripper 30 the same as before referred to.

In carrying out my improved method with vthe above form of apparatus, the tubular blank 10 is brought from the piercer and is deposited in the trough 12, the cylinder 14: is operated and the pusher 15 advances to force the blank into the first pass of thc rolls and onto the mandrel 22. When the blank has passed the front end of the mandrel which projects beyond the plug, the pusher is withdrawn pulling the mandrel through the first pass to the opposite side of the rolls and leaving the tube in the position in which it was delivered by the rolls or resting on the supports 21. The cylinders 25 are now operated and the swinging supports 27 moving upward lift the tubular blank from the supports 21, and when the outer ends of the swinging supports 26 strike the trough 28 as shown in dottedlines Fig. 4, the said swinging. supports will be inclined so as to cause the tubular blank to roll from the concave seats 27 into the trough 28. After the blank is raised the mandrel 22 is returned to the position indicated in Fig. 1 by the pusher in position to receive the next blank coming through that pass. In this manner the tubular M'blank is brought into line with the second pass and the cylinder 29 is then operated to force said tubular blank through the second pass onto the mandrel 7. The gripper on the pusher then seizes the front end of the mandrel 7 and pulls it through the pass to the opposite side of the rolls leaving the'tubular blank 10 resting on the supports 8 with the hoods 17 inclosing said tube as. shown in. Fig. 3. Power is then applied to operate the cylinder 18 and the hoods 17 are swung l to the position indicated in dotted lines Fig.

3,- whereupon the tubular blank is forced from the supports 8 and falls down the skids 20 into the trough 11 which is in line with the third pass. The cylinder 13 is now operated and its pusher advances the tubular blank through the third pass onto the mandrel'23 when the gripper seizes said Inandrel and draws its back to the opposite side ofthe roll leaving the tube in position to be delivered to the conveyer 32 to be carried to a suitable expanding mill for a further operation on the tube.

- the above method I am enabled to employ a three-high or other mill having upper and lower passes in connection with the rolling of seamless tubing in such a manner as to dispense with the cumbersome tablesand the mandrels permanently carried thereby for lifting the tubes to the different passes, and I further avoid the feeding of the tubes oft' the mandrel bars onto the mandrel bars at the opposite side of the rolls. The mandrel bars are withdrawn each time leaving the tube in position to be delivered by itself to an upperorl lower pass which requires no power except to lift the tube. In the methods heretofore practised in connection with the rolling of tubes in a three-high or other mill having upper and lower passes great diiiiculty was experienced in feeding the tube from the mandrels to which they had been delivered, and the operations were so slow that it was practically impossible to handle hot tubes on such mills. By withdrawing the mandrel each time the heat of the blank is maintained and the mandrel bars do not become as highly heated, and it is not found necessary to water-cool the mandrels which tends to reduce the heat of the blank. Furthermore, by passing the tube through a different pass each time, the first pass does practically all the roughing work while the second and third passes tend to give a better finish to the interior as well as to the exterior of the tube.

What I claim is:

1. The method of rolling seamless tubing consisting in feeding the tubular blank through a pass of a mill having upper and lower passes onto a mandrel, withdrawing the mandrel leaving the blank in the position in which it was delivered from the rolls, moving the blank to a different level into line with another pass of said mill, passing the blank back through said last named pass onto a mandrel, and withdrawing the mandrel.

2. The method of rolling seamless tubing consisting in feeding the tubular blank through the pass of a mill having upper and lower passes onto a mandrel,- seizing .the mandrel at its front end and drawing it to the opposite side of the rolls, lifting the blank from the position in which it was delivered from the rolls to a different level into line with another pass of said mill, and passing the blank through said last named pass onto a mandrel, and withdrawing the last named mandrel through the pass to the opposite side of the rolls.

l 3. The method of rolling seamless tubing consisting in feeding the tubular blank through the pass of a mill having upper onto another mandrel, and withdrawing said 10 and lower passes onto a mandrel, wthdrawlast named mandrel. ing the mandrel through the rolls to the In testimony whereof, I the said RICHARD opposite side therof, lifting u blanlii gom BROCK have hereunto setmy hand.

5 the osition in w ich it was e ivere om the Iroll to a different level into line with RICHARD E BROOK another pass of said mill, returning said Witnesses: mandrel to its original position, passing said l ROBERT C. To'rTEN, blank back through said last named pass JOHN F. WDJL. 

